View Single Post
Old 15th Nov 2017, 11:11 pm   #158
Radio Wrangler
Moderator
 
Radio Wrangler's Avatar
 
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,799
Default Re: Magnetic Loop Receiving Aerial (Gary Tempest)

Yep, Andy, that's a goniometer. They also get used in some colour TV test gear to vary subcarrier phase.

In the DF receiver, the static, orthogonal coils in the goniometer create a scale model in 2-dimensions of all the signals in the environment where the receiving loops are. the sense loop swung around inside the gonipmeter gives a standard 2-nulls pattern. It's equivalent to swinging a single loop around outside.

One of the benefits of having a loop is the ability to plant a null on your worst QM source.
It's worth making a goniometer. and this wayheloops inthe garden don't have to move.

David
__________________
Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done
Radio Wrangler is online now